.kb_vedio_con {
    min-width: 640px;
    width: 60vw;
    position: relative;
    margin: 20px auto;
}

#kb_vedio_box {
    min-width: 640px;
    width: 60vw;
    min-height: 450px;
    height: 40vw;
}
#kb_vedio_box > iframe {
    width: 100%;
    height: 100%;
}

#kb_vedio_menu {
    height: 30px;
    margin-bottom: 5px;
}
#kb_vedio_menu > button {
    height: 30px;
    width: auto;
    font-size: 16px;
    color: gray;
    background-color: white;
    border: none;
    border-radius: 5px;
    margin-right: 16px;
    outline: none;
    transition: 1s;
}
#kb_vedio_menu > button:hover {
    box-shadow: 5px 5px 5px lightsteelblue;
}
#kb_vedio_list {
    min-height: 60px;
    margin-top: 5px;
    margin-bottom: 1px;
    padding: 1px 0 0 16px;
    border-top: 5px solid whitesmoke;
}
#kb_vedio_list > ul {
    padding: 0;
    display: none;
}
#kb_vedio_list > ul > li {
    float: left;
    margin-right: 18px;
    color: gray;
    border-bottom: 1px solid lightgray;
    transition: 1s;
}
#kb_vedio_list > ul > li:hover {
    box-shadow: 5px 5px 5px lightsteelblue;
}
#kb_vedio_info {
    margin-top: 1px;
    padding-top: 6px;
    padding-left: 1em;
    color: gray;
    font-size: 16px;
    letter-spacing: 1px;
    border-top: 5px solid lightcyan;
}
#kb_vedio_info > p {
    margin: 1px 0 6px 0;
}

